$\tan\left(-1\right)\left(\frac{x}{y}\right)$
$\left(y^2-x^2\right)dx-\left(2xy\right)dy=0$
$\cos\theta=\frac{1}{2},s_{i},0<\theta<2\pi$
$x^2+5x-9$
$2187-87$
$\int7\cos^2\left(4x\right)dx$
$3ab+9ab-7ab$
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